Hi, We have bunch of machines with EM7421 modems that sometimes experience mysterious communication breaks for which we have been unable to find any cause. But looking at modems with ATI-command I get: Manufacturer: Sierra Wireless, Incorporated Model: EM7421 Revision: SWI9X50C_01.14.03.00 b06b…

Drivers in stock Debian are not valid for this ? So drivers from MBPL are required ?

I don’t know, you can give a try

EM7421 firmware upgrade

jyijyi April 29, 2025, 10:28am 2

You can just upgrade the firmware after installing the MBPL USB drive

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